rotary evaporator
rotary evaporator

What is a Rotary Evaporator?

A rotary evaporator is an indispensable equipment for the processes of evaporation, concentration, crystallization, drying, separation, and solvent recovery in many fields, and it is mainly used for continuous distillation of large amounts of volatile solvents under reduced pressure. It can be said that a rotary evaporator has a great number of applications. Not only can it be used in the small and pilot experiments, but it can be applied in the production in the biological, pharmaceutical, chemical and even food-making industries.

Applications of a Rotary Evaporator

As an essential separation equipment, a rotary evaporator can remove a volatile solvent from a liquid mixture through evaporation and condensation. In industrial field, people use rotary evaporators to extract cbd, which is the main component of mariguana. And cbd is usually used to be made into medicine in pharmaceutical field. In people’s daily life, rotary evaporators are used at home for extracting water from all kinds of juices, which makes juices have a better taste. In chemical and biochemical labs, rotary evaporators are used by professors to extract chemical substances, which will be further applied for other chemical purposes.

In recent years, the application of rotary evaporator has been extended to the cooking industry. Molecular cooking is a science that applies the principles of chemistry and physics to cooking. To some extent, molecular cooking has been promoted to be a proper term for describing innovative cooking styles. It is synonymous with cutting-edge technology and even psychology. The use of a rotary evaporator to non-heat evaporate liquid, thus retaining volatile aromatics that are easily lost by heating, is a perfect combination of modern culinary and experimental instruments.

Because of so many applications, a rotary evaporator has been quite well-received these days.

Working Principle of a Rotary Evaporator

A rotavap evaporates solvents from samples by utilizing the principle that the solvent will have a lower boiling point at a reduced pressure. Specifically speaking, the stepless speed regulation is adopted to make the evaporation flask rotate at a constant speed. By the rotation, materials can form a large area of uniform thin film on the inner wall of the flask. The evaporation flask is heated evenly by a water or oil bath, and materials, with a lower boiling point, is evaporated rapidly under the vacuum condition. The solvent steam is recycled in the receiving flask after being cooled by the high efficiency glass condenser.

Primary Advantage of a Rotovap over Traditional Distillation

Higher efficiency, together with better accuracy, is the primary advantage of using a rotary evaporator over traditional distillation.

A rotary evaporator is electronically controlled so that the rotation of the flask can be kept at a constant speed, and the mixture can form a film on the inner surface of the flask, creating a larger surface for heating. All of these factors contribute to the faster evaporation speed of solvent, which means higher efficiency and better accuracy.

The traditional distillation is less efficient and accurate than a rotary evaporator. When adopting the distillation, a mixture is heated to the temperature at which one component will boil. Then the vapor from the hot mixture is collected and recondensed into liquid, which is fast. But actually many kinds of mixtures cannot be separated by this way. Therefore, comparing to the distillation, a rotary evaporator is more widely used in the chemical laboratories, industrial, bio-pharmaceutical and food-making fields.

Can a Rotary Evaporator Remove Water?

A rotary evaporator is an equipment that can separate different kinds of substances out of the mixtures or concentrate materials. Therefore, a rotary evaporator can be used to remove water.

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